import re
s = 'gduyahduiwhuid:djsiajiwjidsajklwnijiojdwiojdnvjniunwi,https://img0.baidu.com/it/u=193,3213&fm=232/F1114%2F040221103339%2F210402103339-8-1200.jpg'

pattern = 'https://img\d{1}.baidu.com/it/u=\d*,\d*&fm=\d*/\S*.jpg'
lst = re.findall(pattern, s)
print(lst)